Hair trimmer



FIG. 1 is a perspective view of our new design for a hair trimmer;

FIG. 2 is a front view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

CLAIM The ornamental design for a hair trimmer, as shown and described.